Assertion ; Oxidation number of C in HCHO is zero Reason ; Formaldehyde is a covalent compound.
1)If both assertion and reason are true and reason is the correct explanation of assertion 2) If both assertion and reason are true and reason is not the correct explanation of assertion
3) If assertion is true but reason is false
4)If both assertion and reason are false
Answers
Answer:
Correct option is B)
The assertion is correct.
Deriving the oxidation number of carbon in this compound is easy. We know the oxidation number of hydrogen is +1 and of oxygen is -2.So add it up we find carbon equal to zero.
Let the oxidation state of C be x. The oxidation state of H and O are +1 and -2 respectively.
Therefore, 1×(+1)+1×(x)+1×(+1)+1×(−2)=0
⟹1+x+1−2=0
⟹x=2−2=0
The reason is also correct. HCHO is a covalent organic compound containing an aldehyde functional group. But this is not the correct reason for the assertion.
Hence, Option B is the correct answer
(2) If both assertion and reason are true and reason is not the correct explanation of assertion is the correct.
Explanation:
1.The assertion is correct because the oxidation number of carbon in this compoundas we know the oxidation number of hydrogen is +1 and of oxygen is -2.So add it up we find carbon equal to zero.
2.Let the oxidation state of C be x. The oxidation state of H and O are +1 and -2 respectively.Therefore, 1×(+1)+1×(x)+1×(+1)+1×(−2)=0
⟹1+x+1−2=0
⟹x=2−2=0
3.The reason is also correct but not the correct explanation to the assertion because HCHO is a covalent organic compound containing an aldehyde functional group. But this is not the correct reason for the assertion.